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Root Why partition the sdcard?

It's used for a2sd, mostly:

[Script][A2SD] Darktremor Apps2SD 2.7.5.2 (10/03/2010) - xda-developers

The sdcard is normally partitioned with the fat32 filesystem. The point is to shrink that partition and add a separate ext partition, which is native to linux. You then use a2sd to copy all your apps to the sdcard. Normally, you can only use froyo apps2sd to copy certain apps to the sdcard only when developers allow it. That particular way also disables the use of widgets for those apps. With a2sd, it's on a separate partition, so those concerns are gone, plus you can move way more apps to the sdcard. That's a bit of a simplified explanation, so I suggest you read the a2sd link.
 
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